<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .canvas {
            width: 200px;
            height: 100px;
            border: 1px solid #ccc;
        }
    </style>
</head>

<body>
    <canvas id="canvas" class="canvas"></canvas>
    <script>
        function draw() {
            var canvas = document.getElementById("canvas");
            if (canvas.getContext) {
                var ctx = canvas.getContext('2d');
                ctx.beginPath();
                ctx.moveTo(75, 80);
                ctx.lineTo(100, 75)
                ctx.lineTo(100, 25)
                ctx.fill();
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    </script>
</body>

</html>